초록 ▼

A system for indicating a position of a piston inside a cylinder of a control valve. The indicator of the present invention has an enclosed shaft which prevents the use of the shaft to tamper with the piston. The position of the shaft inside a shaft housing is indicated using a pair of magnets a fir

A system for indicating a position of a piston inside a cylinder of a control valve. The indicator of the present invention has an enclosed shaft which prevents the use of the shaft to tamper with the piston. The position of the shaft inside a shaft housing is indicated using a pair of magnets a first magnet is connected to a first end of the shaft and a second magnet is slidably mounted to an outside of the shaft housing. As the shaft moves the first magnet inside the housing, the second magnet moves outside the housing. The second magnet and shaft housing are enclosed in a transparent housing to prevent damage. The shaft housing has a threaded connector for connecting the shaft housing to a valve housing over the piston to prevent leakage through the shaft housing. A groove in a second end of the shaft receives teeth from a toothed retaining ring affix the shaft to the piston. The second end of the shaft also has a tapered end to allow the shaft to be connected to the piston without removing the piston from the housing.

대표청구항 ▼

[ What is claimed is:] [1.] Apparatus for indicating a position of a movable device inside an assembly comprising:a housing;a shaft slidably mounted inside said housing;a first end of said shaft positioned inside said housing;a second end of said shaft protruding from an opening in said housing into

[ What is claimed is:] [1.] Apparatus for indicating a position of a movable device inside an assembly comprising:a housing;a shaft slidably mounted inside said housing;a first end of said shaft positioned inside said housing;a second end of said shaft protruding from an opening in said housing into said assembly;a groove around the circumference of said shaft proximate said second end that receives teeth from a toothed retainer ring affixed to said movable device to fixedly engage said shaft and said movable device;said first end of said shaft sliding inside said housing responsive to said movable device moving inside said assembly; andmeans on said outside of said housing for indicating a position of said first end of said shaft inside said housing.